.rdg-layout{width:100%;max-width:var(--shell);padding-inline:var(--gutter);margin-inline:auto}.rdg-layout>article{margin-inline:auto}@media (min-width:1100px){.rdg-layout:not(:has(>.rdg-rail)){max-width:calc(860px + 2 * var(--gutter))}.rdg-layout:has(>.rdg-rail){max-width:calc(860px + 208px + 64px + 2 * var(--gutter));grid-template-columns:208px minmax(0,1fr);align-items:start;gap:0 64px;display:grid}.rdg-layout:has(>.rdg-rail)>article{min-width:0;max-width:860px;margin-inline:0}}.rdg-prog{top:var(--nav-h);z-index:90;background:var(--bg);border-bottom:1px solid var(--rule-soft);opacity:0;pointer-events:none;transition:opacity var(--t) linear;position:fixed;left:0;right:0}.rdg-prog[data-started=true]{opacity:1}.rdg-prog__meta{width:100%;max-width:var(--shell);height:26px;padding-inline:var(--gutter);font-family:var(--stack-body);font-size:var(--fs-b5);font-weight:var(--w-label);letter-spacing:var(--track-label);text-transform:uppercase;white-space:nowrap;color:var(--fg-faint);justify-content:space-between;align-items:center;gap:16px;margin-inline:auto;line-height:1;display:flex}.rdg-prog__pos{color:var(--fg-muted)}.rdg-prog__slash{color:var(--fg-faint);padding-inline:5px}.rdg-prog__track{height:2px;position:absolute;bottom:-2px;left:0;right:0;overflow:hidden}.rdg-prog__fill{background:var(--fg);transform-origin:0;will-change:transform;width:100%;height:100%;transform:scaleX(0)}@media (min-width:768px){.rdg-prog__meta{height:28px;font-size:var(--fs-b5)}}.rdg-rail{border-bottom:1px solid var(--rule-soft);overscroll-behavior-x:contain;scrollbar-width:none;-webkit-overflow-scrolling:touch;margin:0 0 30px;padding-bottom:8px;overflow-x:auto}.rdg-rail::-webkit-scrollbar{display:none}.rdg-rail__label{display:none}.rdg-rail__list{gap:2px;margin:0;padding:0;list-style:none;display:flex}.rdg-rail__item{list-style:none}.rdg-rail__link{min-width:44px;min-height:44px;font-family:var(--stack-body);font-size:var(--fs-b5);font-weight:var(--w-label);letter-spacing:var(--track-label);color:var(--fg-faint);transition:color var(--t) linear;border:0;border-radius:0;justify-content:center;align-items:center;padding-inline:10px;line-height:1;display:inline-flex}.rdg-rail__link:hover{color:var(--fg)}.rdg-rail__link[aria-current=page]{background:var(--acc-soft);color:var(--acc-bright)}.rdg-rail__link:focus-visible{outline-offset:-2px}.rdg-rail__t{white-space:nowrap;clip-path:inset(50%);border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (min-width:1100px){.rdg-rail{top:calc(var(--nav-h) + 48px);max-height:calc(100vh - var(--nav-h) - 96px);scrollbar-width:none;border-bottom:0;margin:0;padding-bottom:0;position:sticky;overflow:visible auto}.rdg-rail::-webkit-scrollbar{display:none}.rdg-rail__label{font-family:var(--stack-mono);font-size:var(--fs-m1);font-weight:var(--w-m);line-height:var(--lh-tight);letter-spacing:var(--track-label);text-transform:uppercase;color:var(--fg-faint);margin:0 0 14px;display:block}.rdg-rail__list{display:block}.rdg-rail__item{border-top:1px solid var(--rule-soft)}.rdg-rail__item:first-child{border-top:1px solid var(--rule)}.rdg-rail__item:has(.rdg-rail__link[aria-current=page]){border-top-color:var(--fg)}.rdg-rail__link{min-width:0;min-height:44px;font-family:var(--stack-body);font-size:var(--fs-b3);letter-spacing:0;line-height:var(--lh-ui);color:var(--fg-muted);font-weight:var(--w-body);background:0 0;grid-template-columns:auto minmax(0,1fr);align-items:baseline;gap:10px;padding:11px 0;display:grid}.rdg-rail__link:focus-visible{outline-offset:3px}.rdg-rail__link[aria-current=page]{color:var(--fg);background:0 0}.rdg-rail__n{font-family:var(--stack-body);font-size:var(--fs-b5);font-weight:var(--w-label);line-height:var(--lh-tight);letter-spacing:var(--track-label);color:var(--fg-faint);justify-self:start;padding:2px 4px}.rdg-rail__link[aria-current=page] .rdg-rail__n{background:var(--acc);color:var(--acc-ink)}.rdg-rail__t{white-space:normal;clip-path:none;width:auto;height:auto;margin:0;position:static;overflow:visible}}@media (prefers-reduced-motion:reduce){.rdg-prog,.rdg-prog__fill,.rdg-rail__link{transition:none}}@media print{.rdg-prog{display:none}}.reader .sell__items{font-size:var(--fs-b3);font-weight:var(--w-body);line-height:var(--lh-prose);letter-spacing:0;text-transform:none;color:var(--ac-panel-read);max-width:58ch;margin:clamp(18px,4vw,24px) 0 0}.reader .quiz__done{font-size:var(--fs-b3);letter-spacing:0;color:var(--fg-faint);max-width:46ch;margin:clamp(20px,4vw,26px) 0 0}